Ad Group

What It Is

An ad group is a container inside a Google Ads (or Microsoft Ads) campaign that holds a tightly themed set of keywords and the ads written to match those keywords. A single campaign usually contains several ad groups, with each ad group focused on one specific service or intent. For example, a plumber’s “Emergency Services” campaign might have separate ad groups for “burst pipe,” “water heater leak,” and “clogged main line.”

Why It Matters

Ad group structure is the single biggest lever you have on whether someone searching for what you actually do sees an ad that matches their words. When your ad copy mirrors the keyword they typed, your click-through rate goes up, your Quality Score goes up, and your cost per click goes down. Loose, oversized ad groups with 40 mismatched keywords are one of the most common reasons local accounts overpay for clicks.

Common Misconception

People assume more keywords per ad group means more reach. The opposite is usually true. Cramming “plumber,” “water heater repair,” and “drain cleaning” into one ad group forces a single generic ad to cover three different searches, and Google’s algorithm rewards the ones with the tightest match between query, keyword, and ad copy.

FAQ

How many keywords should I put in one ad group?

For a local service business, 5 to 15 closely related keywords per ad group is a good range. If you find yourself adding a 20th keyword, that’s usually a sign the ad group should be split into two.

Does this matter for Performance Max campaigns?

Performance Max uses “asset groups” instead of ad groups, but the principle is similar. Each asset group should be tightly themed around one service or product line, not a grab-bag of everything you offer.

Can I copy ad groups between campaigns?

Yes. Google Ads lets you copy ad groups along with their keywords and ads, which is useful when you’re expanding into a new service area or duplicating a structure that works. Just remember to update the location targeting on the new campaign.